Author: leonid
Date: 11:40:37 02/10/01
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On February 10, 2001 at 13:27:32, Uri Blass wrote: >On February 10, 2001 at 12:43:05, leonid wrote: > >>On February 10, 2001 at 12:00:30, Uri Blass wrote: >> >>>On February 10, 2001 at 11:08:17, leonid wrote: >>><snipped? >>>>What is the "ss=10" ? >>> >>>ss is the selectivity search parameter of chessmaster. >>> >>>I know from experience that chessmaster is usually faster in solving problems if >>>I give it bigger selectivity. >>> >>>The default value is 6 and the maximal value is 10. >> >>Probably it is the maximum number of moves to see in each ply. When mine solved >>this position this variable was at 6. >> >>Leonid. > >It is not. > >I believe that it is about null move pruning. If it is really so, my guess is completely wrong. I even feel me sure that null move in mate solutions is the wrong way to proceed. It should lead to mistakes. >Chessmaster shows two depthes. >The first number is usually small(1 in the first iterations). >The second number is bigger when the difference between them is not more than >the selectivity. I am lost. >I guess that Chessmaster does not use the null move pruning in the first plies >but it is using null move pruning everywhere in the tree later. As I said before, after the description of the null move that I have read here, null move should lead to mistakes. Since Chess Master is very good in solutions of mates, I presume that he do something different. It could be that somebody could indicate what it really is. >I believe that when chessmaster shows depth 1/4 it means that it looks at >everything at depth 1 in the tree. >It also looks at everything at depth 4 except move that it prunes because of >null move pruning and it also does a lot of extensions so it can practically see >mate in 10 at depth 1/4. > >I know from experience that chessmaster waste a lot of time on stupid lines if I >give it a low selectivity because it does not prune lines with no threat. Problem with all those stupid moves is that sometime they are the best one. I remember Chess Master 4000 as impecable solver but not the quickest one. I prefere impecable to quick and buggy. Leonid. >Uri
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